Table 3.

Loss to Follow-Up, Improvement in Oral Health–Related QoL, and Self-Reported Oral Health Complaints by Intervention, Excluding GP Offices With Follow-Up <60%

	Experimental	Control	χ² Statistic	P Value	Intracluster Correlation Coefficient	Adjusted χ² Statistic	Adjusted P Value
Study details
No. of GP offices	8	10
No. of study participants	210	318
Loss to follow-up
GP offices	0 (0)	0 (0)	N/A	N/A	N/A	N/A	N/A
Study participants	39 (18.6)	48 (15.1)	1.111	.292	0.067	0.356	.551
Improvement in oral health–related QoL^{^a}	n = 120^{^b}	n = 205^{^b}
Functional limitation	17 (14.2)	17 (8.3)	2.788	.095	–0.005^{^c}	2.788	.095
Physical pain	37 (30.8)	43 (21.0)	3.964	.046	–0.005^{^c}	3.964	.046
Psychologic discomfort	21 (17.5)	20 (9.8)	4.118	.042	–0.008^{^c}	4.118	.042
Physical disability	12 (10.0)	12 (5.9)	1.903	.168	0.033	1.152	.283
Psychologic disability	22 (18.3)	17 (8.3)	7.226	.007	0.007	6.355	.012
Social disability	4 (3.3)	8 (3.9)	0.069	.793	–0.018^{^c}	0.069	.793
Handicap	15 (12.5)	10 (4.9)	6.193	.013	0.010	5.173	.023
OHIP-NL14 total score	46 (38.3)	51 (24.9)	6.545	.011	–0.005^{^c}	6.545	.011
Improvement in self-reported oral health complaints	n = 171^{^b}	n = 270^{^b}
Pain in mouth	26 (15.2)	28 (10.4)	2.277	.131	0.011	1.764	.184
Dry mouth	26 (15.2)	56 (20.7)	2.120	.145	–0.007^{^c}	2.120	.145
Bad breath	16 (9.4)	16 (5.9)	1.831	.176	–0.030^{^c}	1.831	.176
Any	59 (34.5)	85 (31.5)	0.436	.509	–0.009^{^c}	0.436	.509

GP = general practitioner; N/A = not applicable because GP office is cluster level itself; OHIP-NL14 = 14-item Oral Health Impact Profile; QoL = quality of life.
Note: Data in Experimental and Control columns from Loss to follow-up down are presented as n (%).
↵a Subdomains according to Slade.²¹
↵b Number of patients with a completed baseline and follow-up questionnaire.
↵c To calculate adjusted χ² statistics, negative intracluster correlation coefficients were set to 0 for these variables.^30,31